Product Summary:
This EG4 energy storage kit combines the FlexBOSS21 Hybrid Inverter with the 14.3kWh WallMount Indoor Battery to deliver a powerful, all-in-one solution for residential and commercial systems. The WallMount provides UL-certified LiFePO₄ storage, 8,000+ cycles at 80% DoD, self-heating for cold-weather performance, emergency stop capability, and RS485/CANBus integration for seamless closed-loop communication. The FlexBOSS21 delivers 12kW output with up to 21,000W PV input, 3 MPPTs supporting 5 strings, and 90A grid feed-through at 120/240VAC. With GridBOSS MID integration, it enables smart load management, AC coupling, and generator support for superior flexibility. Equipped with rapid shutdown, ground and arc fault protection, remote monitoring, Wi-Fi connectivity, and mobile alerts, this kit provides efficient, scalable, and future-ready energy storage for both grid-tied and off-grid applications.
EG4 Wallmount 280Ah Indoor Battery & FlexBoss21 Hybrid Inverter (ESS) | 14.3-57.2kWh | UL9540 | Grid-Tied Home Solar System (21kW-42kW PV)
$7,425.00
SKU# K0106
Battery Selected
1× EG4 280Ah Indoor
Total Capacity
14.3 kWh
Inverter Selected
1× EG4 FlexBOSS21
Input / Output
21 kW / 16 kW
Choose Your ESS Configuration*
1x Inverter
Standard
2x Inverter
Large
Quantity:
.
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Battery Downloads
Battery Specifications
System Voltage:48V
Nominal Voltage:51.2V
Chemistry:LiFePO4
kWh Capacity:14.3kWh
Ah Capacity:280Ah
BMS Charging Voltage (Bulk/Absorb):56V (±0.8V)
Rec. Charging Voltage (Bulk/Absorb):56.2V (±0.2V)
Rec. Float Setting:54V (±0.2V)
Rec. SoC Cutoff Setting:20%
Max. Continuous Charge/Discharge Current:200A
Rec. Charge Current:60 – 160A
Rec. Discharge Current:160A
Max Continuous Discharge Rate:10240W
Voltage:56V
Power Consumption:224W
Internal Temperature Cutoffs:≤32ºF (On) | ≥41ºF (Off)
Charging Temperature Range:32ºF – 113ºF (0ºC – 45ºC)
Discharging Temperature Range:-4ºF – 122ºF (-20ºC – 50ºC)
Storage Temperature Range:-4ºF – 122ºF (-20ºC – 50ºC)
Protection Rating:IP20
Communications:RS485 | CANBus
Weight:282.2 lbs (128 kg)
Depth:9.6 in (245 mm)
Width:18.1 in (460 mm)
Height:36.4 in (925 mm)
Inverter Downloads
SKU#:K0106
Spec Sheet:
DOWNLOAD
DOWNLOADUser Manual:DOWNLOAD
DOWNLOADUL1741 Certificate:DOWNLOAD
DOWNLOADCEC Listing- EG4 FlexBoss21:
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GO TO LINKInverter Specifications
Nominal AC Voltage:120/240VAC | 120/208VAC (L1/L2/N required)
Frequency:60 Hz (Default) | 50 Hz
Max. AC Current:50A @ 240V | 57.7A @ 208V
Max. AC Input Power:12000W
Max. AC Bypass:90A
Operating Voltage Range:180 – 270VAC
Output Voltage:120/240VAC | 120/208VAC (L1/L2/N required)
Max. Output Current:66.7A
Output Frequency:60 Hz (Default) | 50 Hz
Nominal Output Power (without PV):12000W @ 240V | 12000W @ 208V
Nominal Output Power (with PV):16000W @ 240V | 13800kW @ 208V
Power Factor:0.99 (Full Load)
Reactive Power Adjustment Range:-0.8 – 0.8 Leading Adjustable
Total Harmonic Distortion:<5% (Full Load)
Transfer Time:20ms (Default) | 10ms (Configurable) | 20ms (Parallel)
Rated Output Current:50A @ 240V | 57.7A @ 208V
Nominal Output Voltage:120/240VAC | 120/208VAC
Rated Output Power:12000W @ 240VAC | 12000W @ 208VAC
Peak Power:24000W (0.5 sec) | 18000W (1 sec)
15000W (6 min) | 13200W (12 min)
15000W (6 min) | 13200W (12 min)
Operating Frequency:60 Hz (Default) | 50 Hz
Total Harmonic Distortion Voltage:<5%
Transfer Time:20ms (Default) | 10ms (Configurable) | 20ms (Parallel)
No. of MPPTs:3
Inputs per MPPT:2 (MPPT 1) | 2 (MPPT 2) | 1 (MPPT 3)
Max. Usable Input Current:26A (MPPT 1) | 26A (MPPT 2) | 15A (MPPT 3)
Max. Short Circuit Input Current:31A (MPPT 1) | 31A (MPPT 2) | 19A (MPPT 3)
DC Input Voltage Range:100 – 600VDC
Unit Start-Up Voltage:100VDC
MPPT Operating Voltage Range:120 – 440VDC
Nominal MPPT Voltage:360VDC
Max. Utilized PV Array Power:21000W
Max. Recommended PV Input:25000W
Max. Efficiency:97% (PV to Grid) | 94.5% (PV to Battery) | 94% (Battery to Grid)
Idle Consumption:<65W
Nominal Voltage:48VDC
Voltage Range:40 – 60VDC
Max. Charge / Discharge Power:12000W
Recommended Battery Capacity per Inverter:>300Ah
Operating / Storage Temperature Range:-13ºF – 140ºF (-25ºC – 60ºC)
Operating Altitude:<6,561 ft (2000 m)
Relative Humidity:0 – 100%
Typical Noise Emission:<50dB @ 3 ft
Design Topology:High-Frequency / Transformerless
Protection Rating:IP65 / NEMA 4X
Communications:RS485 / CANBus / WiFi
Max. Parallel Connections:16
Weight:88 lbs (40 kg)
Depth:11.3 in (287 mm)
Width:22.3 in (567 mm)
Height:30.5 in (775 mm)
Compare Battery & Inverter
FlexBoss21 Inverter: 10-Year EG4 Manufacturer Warranty
WallMount Indoor Battery: 10-Year EG4 Manufacturer Warranty
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